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Surface mobility gradient and emergent facilitation in glassy films

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arxiv 2402.11210 v1 pith:ZYKK6YX5 submitted 2024-02-17 cond-mat.soft cond-mat.dis-nn

Surface mobility gradient and emergent facilitation in glassy films

Qiang Zhai , Xin-Yuan Gao , Chun-Shing Lee , Chin-Yuan Ong , Ke Yan , Hai-Yao Deng , Sen Yang , Chi-Hang Lam This is my paper
classification cond-mat.soft cond-mat.dis-nn
keywords glassyfilmsfacilitationfilmflowfreemobilitysurface
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Confining glassy polymer into films can substantially modify their local and film-averaged properties. We present a lattice model of film geometry with void-mediated facilitation behaviors but free from any elasticity effect. We analyze the spatially varying viscosity to delineate the transport property of glassy films. The film mobility measurements reported by [Yang et. al., Science, 2010, 328, 1676] are successfully reproduced. The flow exhibits a crossover from simple viscous flow to a surface-dominated regime as temperature decreases. The propagation of a highly mobile front induced by the free surface is visualized in real space. Our approach provides a microscopic treatment of the observed glassy phenomena.

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